99942 Apophis (2004 MN4)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.1911663196 ± 2.00e+00
Semi-major axis (a)0.9223804710 AU ± 3.00e+00
Inclination (i)3.34095673° ± 4.00e+00
Long. of Asc. Node (Ω)203.89962943° ± 5.00e+00
Arg. of Perihelion (ω)126.67282559° ± 6.00e+00
Mean Anomaly (M)312.80548085° ± 2.46e-06
Mean Motion (n)1.1126206784°/day ± 5.43e+00
Perihelion dist (q)0.74605239 AU ± 3.05e+00
Aphelion dist (Q)1.09870855 AU ± 4.02e+00
Orbital Period0.88586012 yr ± 4.32e+00
NGA Modelr2
A1-3.03172826e-03 AU/d²
A2-2.37461812e-06 AU/d²
Physical Parameters
H (abs. magnitude)19.00
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-04-29
RMS Residual0.213″
Uncertainty0
Orbit TypeAten
MOID0.000007 AU
Observations Used8720
Oppositions2
Arc Total2004-2021
First Observation Used2004-03-15
Last Observation Used2021-05-20
Observations (10797)
Date Type RA Dec Mag Band Observatory
2021-03-22 12:40:02 C 08 29 56.99 +05 10 18.0 t P66
2021-03-22 12:48:00 C 08 29 56.09 +05 10 31.6 t P66
2021-03-22 12:55:47 C 08 29 55.21 +05 10 44.9 t P66
2021-03-22 13:03:33 C 08 29 54.32 +05 10 58.3 t P66
2021-03-22 13:11:21 C 08 29 53.43 +05 11 11.8 t P66
2021-03-22 13:19:06 C 08 29 52.55 +05 11 25.0 t P66
2021-03-22 16:18:59 C 08 29 36.84 +05 16 46.6 q C97
2021-03-22 16:19:57 C 08 29 36.74 +05 16 48.1 q C97
2021-03-22 16:20:54 C 08 29 36.63 +05 16 49.7 q C97
2021-03-22 16:21:51 C 08 29 36.50 +05 16 51.4 q C97
2021-03-22 16:28:15 C 08 29 35.62 +05 16 29.2 q 168
2021-03-22 16:35:30 C 08 29 35.16 +05 17 14.8 q M44
2021-03-22 16:45:53 C 08 29 33.90 +05 17 32.0 q M44
2021-03-22 16:52:14 C 08 29 33.05 +05 17 10.3 q 168
2021-03-22 17:10:26 C 08 29 31.16 +05 18 12.7 q M44
2021-03-22 17:12:14 C 08 29 30.91 +05 17 44.5 q 168
2021-03-22 17:32:15 C 08 29 28.77 +05 18 18.6 q 168
2021-03-22 20:16:23 C 08 29 13.31 +05 23 10.8 V 160
2021-03-22 20:21:42 C 08 29 12.69 +05 23 19.9 V 160
2021-03-22 20:27:02 C 08 29 12.10 +05 23 29.1 V 160
2021-03-22 21:07:25 C 08 29 08.39 +05 24 31.1 V Z80
2021-03-22 21:12:25 C 08 29 07.87 +05 24 39.3 V Z80
2021-03-22 21:12:43 C 08 29 07.10 +05 24 46.7 V L63
2021-03-22 21:17:25 C 08 29 07.34 +05 24 47.4 V Z80
2021-03-22 21:22:20 C 08 29 06.06 +05 25 02.7 V L63
2021-03-22 21:31:58 C 08 29 05.02 +05 25 19.4 V L63
2021-03-22 21:43:51 C 08 29 03.83 +05 25 32.9 V G34
2021-03-22 21:48:04 C 08 29 03.37 +05 25 40.0 V G34
2021-03-22 21:56:28 C 08 29 02.47 +05 25 54.2 V G34
2021-03-23 17:20:49 C 08 27 15.21 +05 59 09.4 q C97
2021-03-23 17:21:46 C 08 27 15.10 +05 59 11.0 q C97
2021-03-23 17:22:44 C 08 27 15.01 +05 59 12.6 q C97
2021-03-23 19:28:29 C 08 27 05.04 +06 02 20.7 V K19
2021-03-23 19:39:31 C 08 27 03.90 +06 02 39.3 V K19
2021-03-23 19:44:59 C 08 27 02.93 +06 02 47.8 q L47
2021-03-23 19:50:29 C 08 27 02.73 +06 02 57.5 V K19
2021-03-23 19:50:47 C 08 27 02.36 +06 02 59.5 q L47
2021-03-23 19:55:25 C 08 27 01.93 +06 03 06.2 a 233
2021-03-23 20:00:00 C 08 27 01.46 +06 03 13.9 a 233
2021-03-23 20:04:35 C 08 27 00.97 +06 03 21.4 a 233
2021-03-23 20:07:17 C 08 27 00.58 +06 03 25.6 q L47
2021-03-23 20:09:08 C 08 27 00.49 +06 03 29.0 a 233
2021-03-23 20:17:29 C 08 26 59.60 +06 03 42.9 V 160
2021-03-23 20:21:37 C 08 26 59.17 +06 03 49.6 V 160
2021-03-23 20:25:46 C 08 26 58.74 +06 03 56.6 V 160
2021-03-23 22:08:00 C 08 26 48.18 +06 06 46.4 V L63
2021-03-23 22:17:09 C 08 26 47.24 +06 07 01.2 V L63
2021-03-23 22:27:17 C 08 26 46.25 +06 07 17.9 V L63
2021-03-23 22:48:58 C 08 26 44.83 +06 07 47.5 V Z80
2021-03-23 22:53:58 C 08 26 44.32 +06 07 54.9 V Z80
Radar Observations (50)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2005-01-27 23:31:00 -100849.1434 0.25 Hz 2380 -1 -1
2005-01-29 00:00:00 192028507.13 4 us 2380 -1 -1
2005-01-29 00:00:00 -102512.9059 0.25 Hz 2380 -1 -1
2005-01-30 00:18:00 195808170.79 4.5 us 2380 -1 -1
2005-01-30 00:18:00 -103799.8178 0.15 Hz 2380 -1 -1
2005-08-07 17:07:00 8186.8 0.2 Hz 2380 -1 -1
2006-05-06 12:49:00 -118256.8 0.1 Hz 2380 -1 -1
2012-12-21 11:10:00 57992.443 0.25 Hz 8560 -14 -14
2012-12-22 11:00:00 102682986.05 0.25 us 8560 -14 -14
2012-12-22 11:00:00 57880.25 0.1 Hz 8560 -14 -14
2013-01-03 09:20:00 97449107.61 0.25 us 8560 -14 -14
2013-01-03 09:20:00 36629.285 0.1 Hz 8560 -14 -14
2013-01-03 10:00:00 97439308.71 3 us 8560 -14 -14
2013-01-03 10:50:00 97428425.46 0.25 us 8560 -14 -14
2013-01-05 08:40:00 30404.009 0.2 Hz 8560 -14 -14
2013-01-05 10:40:00 96911591.52 0.25 us 8560 -14 -14
2013-01-05 10:40:00 20031.16 0.1 Hz 8560 -14 -14
2013-01-05 10:50:00 96910218.03 3 us 8560 -14 -14
2013-01-06 08:20:00 26660.815 0.1 Hz 8560 -14 -14
2013-01-06 09:30:00 20775.144 0.1 Hz 8560 -14 -14
2013-01-08 08:10:00 15496.441 0.1 Hz 8560 -14 -14
2013-01-09 08:00:00 96451449.73 0.2 us 8560 -14 -14
2013-01-09 08:00:00 9670.119 0.1 Hz 8560 -14 -14
2013-01-09 09:20:00 2690.401 0.1 Hz 8560 -14 -14
2013-01-10 08:00:00 96472652.72 0.2 us 8560 -14 -14
2013-01-10 08:00:00 2590.857 0.1 Hz 8560 -14 -14
2013-01-10 09:40:00 96473924.8 0.2 us 8560 -14 -14
2013-01-11 07:20:00 -1589.599 0.2 Hz 8560 -14 -14
2013-01-14 08:10:00 97258343.56 0.2 us 8560 -14 -14
2013-01-14 08:10:00 -30561.776 0.1 Hz 8560 -14 -14
2013-01-14 09:50:00 97283037.17 0.2 us 8560 -14 -14
2013-01-15 06:30:00 -30666.291 0.1 Hz 8560 -14 -14
2013-01-16 06:30:00 98086754 1 us 8560 -14 -14
2013-01-16 06:30:00 -39582.277 0.2 Hz 8560 -14 -14
2013-01-16 07:50:00 -46641.384 0.1 Hz 8560 -14 -14
2013-01-17 06:20:00 -47875.142 0.1 Hz 8560 -14 -14
2013-02-18 00:56:00 -76760.475 0.2 Hz 2380 -1 -1
2013-02-18 01:37:00 157906444.15 0.25 us 2380 -1 -1
2013-02-18 01:37:00 -78041.365 0.2 Hz 2380 -1 -1
2013-02-19 01:08:00 -78105.657 0.2 Hz 2380 -1 -1
2013-02-20 00:38:00 -78070.341 0.2 Hz 2380 -1 -1
2013-02-20 01:26:00 163578875.87 0.25 us 2380 -1 -1
2013-02-20 01:26:00 -79560.965 0.2 Hz 2380 -1 -1
2013-02-21 01:04:00 -79697.13 0.2 Hz 2380 -1 -1
2013-03-15 23:59:00 235220855.07 2 us 2380 -1 -1
2013-03-15 23:59:00 -80977.5254 0.238 Hz 2380 -1 -1
2021-03-03 06:40:00 29329.8 0.4 Hz 8560 -14 -14
2021-03-05 07:00:00 112426746.52 1 us 8560 -14 -14
2021-03-08 02:50:00 112625015.08 1 us 8560 -14 -14
2021-03-11 08:20:00 113796393.86 1 us 8560 -14 -14
Station codes
-14 DSS-14 Goldstone (70-m) -1 Arecibo (305-m, 1963–2020)